1 /* 2 * Copyright (c) 1985, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifdef HAVE_CONFIG_H 31 #include <config.h> 32 #endif 33 34 RCSID("$Id: getusershell.c 21005 2007-06-08 01:54:35Z lha $"); 35 36 #ifndef HAVE_GETUSERSHELL 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <ctype.h> 42 #ifdef HAVE_PATHS_H 43 #include <paths.h> 44 #endif 45 #ifdef HAVE_SYS_TYPES_H 46 #include <sys/types.h> 47 #endif 48 #ifdef HAVE_SYS_STAT_H 49 #include <sys/stat.h> 50 #endif 51 #ifdef HAVE_SYS_PARAM_H 52 #include <sys/param.h> 53 #endif 54 55 #ifdef HAVE_USERSEC_H 56 struct aud_rec; 57 #include <usersec.h> 58 #endif 59 #ifdef HAVE_USERCONF_H 60 #include <userconf.h> 61 #endif 62 #include "roken.h" 63 64 #ifndef _PATH_SHELLS 65 #define _PATH_SHELLS "/etc/shells" 66 #endif 67 68 #ifndef _PATH_BSHELL 69 #define _PATH_BSHELL "/bin/sh" 70 #endif 71 72 #ifndef _PATH_CSHELL 73 #define _PATH_CSHELL "/bin/csh" 74 #endif 75 76 /* 77 * Local shells should NOT be added here. They should be added in 78 * /etc/shells. 79 */ 80 81 static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; 82 static char **curshell, **shells, *strings; 83 static char **initshells (void); 84 85 /* 86 * Get a list of shells from _PATH_SHELLS, if it exists. 87 */ 88 char * ROKEN_LIB_FUNCTION 89 getusershell() 90 { 91 char *ret; 92 93 if (curshell == NULL) 94 curshell = initshells(); 95 ret = *curshell; 96 if (ret != NULL) 97 curshell++; 98 return (ret); 99 } 100 101 void ROKEN_LIB_FUNCTION 102 endusershell() 103 { 104 if (shells != NULL) 105 free(shells); 106 shells = NULL; 107 if (strings != NULL) 108 free(strings); 109 strings = NULL; 110 curshell = NULL; 111 } 112 113 void ROKEN_LIB_FUNCTION 114 setusershell() 115 { 116 curshell = initshells(); 117 } 118 119 static char ** 120 initshells() 121 { 122 char **sp, *cp; 123 #ifdef HAVE_GETCONFATTR 124 char *tmp; 125 int nsh; 126 #else 127 FILE *fp; 128 #endif 129 struct stat statb; 130 131 free(shells); 132 shells = NULL; 133 free(strings); 134 strings = NULL; 135 #ifdef HAVE_GETCONFATTR 136 if(getconfattr(SC_SYS_LOGIN, SC_SHELLS, &tmp, SEC_LIST) != 0) 137 return okshells; 138 139 for(cp = tmp, nsh = 0; *cp; cp += strlen(cp) + 1, nsh++); 140 141 shells = calloc(nsh + 1, sizeof(*shells)); 142 if(shells == NULL) 143 return okshells; 144 145 strings = malloc(cp - tmp); 146 if(strings == NULL) { 147 free(shells); 148 shells = NULL; 149 return okshells; 150 } 151 memcpy(strings, tmp, cp - tmp); 152 for(sp = shells, cp = strings; *cp; cp += strlen(cp) + 1, sp++) 153 *sp = cp; 154 #else 155 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) 156 return (okshells); 157 if (fstat(fileno(fp), &statb) == -1) { 158 fclose(fp); 159 return (okshells); 160 } 161 if ((strings = malloc((u_int)statb.st_size)) == NULL) { 162 fclose(fp); 163 return (okshells); 164 } 165 shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); 166 if (shells == NULL) { 167 fclose(fp); 168 free(strings); 169 strings = NULL; 170 return (okshells); 171 } 172 sp = shells; 173 cp = strings; 174 while (fgets(cp, MaxPathLen + 1, fp) != NULL) { 175 while (*cp != '#' && *cp != '/' && *cp != '\0') 176 cp++; 177 if (*cp == '#' || *cp == '\0') 178 continue; 179 *sp++ = cp; 180 while (!isspace((unsigned char)*cp) && *cp != '#' && *cp != '\0') 181 cp++; 182 *cp++ = '\0'; 183 } 184 fclose(fp); 185 #endif 186 *sp = NULL; 187 return (shells); 188 } 189 #endif /* HAVE_GETUSERSHELL */ 190